There is no good solution as its a world wide issue.I feel like growing vines on the pillars would be a good solution.
Anything that can be tag will be tag from walls to RR equipment. Even bridges over rivers.
Until vines grow around the columns, the columns will be tag as well seen after the vines grow.
ML stated from day one that the sound barrier were to be clean of tags easy, yet ML has yet to remove those tag barriers. Only have to look at the barriers at Dupont and Dundas area.